Coil and condenser assembly for high frequency purposes



April 23, 1940. KAUFMAN 2.198.437

COIL AND CONDENSER ASSEMBLY FOR HIGH FREQUENCY PURPOSES Filed Feb. 4,1938 Fig.3.

ATTO/WVEY Patented Apr. 23, 1940 UNITED STATES PATENT OFFICE- AlbertKaufman, Paris, France Application February 4, 1938, Serial No. 188,610

. "In Great Britain February 8, 1937 2 Claims.

The present invention relates to coil and/or condenser assemblies forhigh frequency purposes.

It is an object of the present invention to provide means for easily andsecurely mounting a coil and/or condenser on a mount.

It is a further object of the invention to avoid, to a great extent,metal parts in order to keep the electro-magnetic losses small.

It is another object of the invention to provide a coil having amagnetic core, the inductivity of the coil being adjustable.

Other objects of the invention will be apparent from the description asit proceeds.

In order that the invention may be more clearly understood someembodiments thereof are described hereinafter with reference to theaccompanying drawing in which:

Figs. 1 and 2 illustrate two embodiments of the invention, and

Fig. 3 illustrates a detail of the embodiment illustrated in Fig. 1.

Fig. 1 illustrates an embodiment for fixing a coil in a mounting plateand illustrates also a coil the inductivity of which can easily beadjusted. The core of the coil, which may comprise finelydividedmagnetic material, consists of two parts 4| and 42. The part 4| isrigidly mounted in a casing 43 the upper part 44 of which is providedwith internal screw-threading. The part 42 of the core is rigidlyconnected to a member 45 provided with external screw-threading engagingthe internal screw-threading of part 44 of the casing 43. In theembodiment shown the coil has three windings 46, 46', 46" provided onthe casing 43. When the member 45 is screwed into the casing asillustrated in Fig. l the two parts 4| and 42 meet within the windingspace (indicated by I in Fig. l) of the coil, at about the middle of thesaid space, i. e. the middle of winding 45'. By rotating the member 45relatively to the casing 43 in one or the other direction the parts 42and 4| of the .core can be brought nearer together or moved away fromeach other respectively. Thus the inductivity of the coil can easily beadjusted. Since both parts 4| and 42 meet each other within the windingspace the alteration of the coeiiicient of efilciency current with whichthe coil is tested) of the coil 55 is altered to a small degree only. Ithas been found that, for example, this coeflicient is altered by only 5%when the inductivity is altered by 15%. One or two windings only or morethan three windings may be provided on the iron core, but in all cases,it is essential that the two parts of the core meet within the windingspace.

As illustrated, the upper part 44 of the casing 43 may be provided witha flange 41, having two openings 48 through which undercut extensions 49of a mounting-plate 50 extend when the coil is inserted in the opening5| of the plate 50. A clamping or spring ring 52, preferably made ofinsulating material and having a slot 53 (see Fig. 3) may be pressed onto the upper part 44 so that it engages the undercut sides of theextensions 49 and thus secures the coil in its position. The casing 43may have a slot at its bottom 43' into which the edge 43" of the openingof the mounting plate 50 may engage, to secure rigidly the lower part ofthe coil.

In a similar manner, a condenser, e. g. a trimming condenser, may bemounted on a plate as illustrated in Fig. 2. In Fig. 2, 60 is a trimmingcondenser as known per se. BI is a mount plate having an opening 62 andprojections 63 which may pass through corresponding openings in a plate64 covering the condenser 60. The projections are undercut asillustrated and a clamping ring 52, having a slot 53 (see Fig. 3) can bepressed on the plate 64 between the extensions 63 whereby the condenseris secured to the mounting plate 6|.

With the arrangement described, unnecessary metallic parts are avoidedby the extensive use of insulating material for mounting. It will easilybe appreciated that, if several windings on one coil or several coilsare used they may act as a high frequency transformer.

I claim:

1. A coil assembly for high frequency equipment, comprising a mountplate of insulating material having an opening therein extending from anedge thereof into the body of said plate, said plate being formed with apair of undercut projections lying in the plane of said plate andextending one on each side of said opening, a high frequency coilarranged axially in said opening, and having at its end nearest saidedge abutment means apertured to pass over said projections so that thelatter project therethrough and engaging said edge of said mount plate,and a removable resilient ring of insulating material of larger diameterthan the distance between the ends of said projections and yieldablypressed into interlocking engagement with the undercut said edgeabutment means apertured to pass over said projections so that thelatter project therethrough and engaging said edge of said mount plate,a'nda removable resilient ring of insulating material of larger diameterthan the distance between the ends of said projections and yieldablypressed into interlocking engagement with the undercut portions of saidprojections to thereby retain said component in position in said mountplate.

AIBERT KAUFMAN.

